GC80503CSM66166SL388 Intel, GC80503CSM66166SL388 Datasheet - Page 61

• Manufacturer Part Number: GC80503CSM66166SL388
• Description: IC MPU 1.9V PENTI 166MHZ 352BGA
• Manufacturer: Intel

Specifications of GC80503CSM66166SL388

• Rohs Status: RoHS non-compliant
• Processor Type: Pentium I w/MMX
• Features: 66MHz Bus
• Speed: 166MHz
• Voltage: 1.9V
• Mounting Type: Surface Mount
• Package / Case: 352-BGA
• Other names: 821225

4.5.5
Datasheet
Figure 26. Settling Time
Although simulated settling time has not shown good correlation with physical, measured settling
time, settling time simulations can still be used as a tool to tune layouts. Use the following
procedure to verify board simulation and tuning with concerns for settling time:
Measurement Methodology
The waveform of the input signals should be measured at the processor pins using an oscilloscope
with a 3 dB bandwidth of at least 20 MHz (100 ms/s digital sampling rate). There should be a short
isolation ground lead attached to a processor pin on the bottom side of the board. A 1-M probe
with loading of less than 1 pF is recommended. The measurement should be taken at the input pins
and their nearest V
1. Simulate settling time at the slow corner for a particular signal.
2. If settling time violations occur (signal requires more than 12.5 ns to settle to ±10% of its final
3. If settling time violations still occur, simulate flight times for five consecutive cycles for that
4. If flight time values are consistent over the five simulations, settling time should not be a
5. Note that, for signals that are allocated two cycles for flight time, the recommended settling
value), simulate signal trace with DC diodes in place at the receiver pin. The DC diode
behaves almost identically to the actual (non-linear) diode on the part as long as excessive
overshoot does not occur.
particular signal.
concern. If, however, flight times are not consistent over the five consecutive cycles, tuning of
the layout is required.
time is doubled. Maximum Settling Time to within 10 percent of V
66 MHz.
V
V
IH3
IH3
Low-Power Embedded Pentium
SS
Max +10%
Min –10%
pins.
Settling Time
®
Processor with MMX™ Technology
000276
IH
or V
2.5V
IL
is 12.5 ns at
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